<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            height: 300px;
            width: 300px;
            margin: 0 auto;
            background-color: pink;
        }
    </style>
</head>
<body>
<div>

</div>
</body>
</html>